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Quantum-cascade laser. Quantum-cascade lasers (QCLs) are semiconductor lasers that emit in the mid- to far- infrared portion of the electromagnetic spectrum and were first demonstrated by Jérôme Faist, Federico Capasso, Deborah Sivco, Carlo Sirtori, Albert Hutchinson, and Alfred Cho at Bell Laboratories in 1994. [1]
Ein Freie-Elektronen-Laser (engl.: free-electron laser, kurz FEL) ist eine Strahlungsquelle, die Synchrotronstrahlung mit sehr hoher Brillanz erzeugt. [1] Da freie Elektronen keine festen Energieniveaus besitzen, ist die emittierte Strahlung kontinuierlich durchstimmbar. Derzeit (2017) sind Wellenlängen bis unter 1 Ångström möglich.
Semiconductor optical gain. Optical gain is the most important requirement for the realization of a semiconductor laser because it describes the optical amplification in the semiconductor material. This optical gain is due to stimulated emission associated with light emission created by recombination of electrons and holes.
Semiconductor saturable-absorber mirror. Semiconductor saturable-absorber mirrors ( SESAMs) are a type of saturable absorber used in mode locking lasers. Semiconductor saturable absorbers were used for laser mode-locking as early as 1974 when p-type germanium was used to mode lock a CO 2 laser which generated pulses of around 500 picoseconds.
A blue laser emits electromagnetic radiation with a wavelength between 400 and 500 nanometers, which the human eye sees in the visible spectrum as blue or violet. [1] Blue lasers can be produced by: direct, inorganic diode semiconductor lasers based on quantum wells of gallium (III) nitride at 380-417nm [2] [3] or indium gallium nitride at 450 ...
Optical cavity. An optical cavity, resonating cavity or optical resonator is an arrangement of mirrors or other optical elements that forms a cavity resonator for light waves. Optical cavities are a major component of lasers, surrounding the gain medium and providing feedback of the laser light. They are also used in optical parametric ...
Femtosekundenlaser. Femtosekundenlaser sind Laser, die Lichtpulse aussenden, deren Dauer im Femtosekunden -Bereich liegt. Das sich mit Lichtgeschwindigkeit ausbreitende Laserlicht legt innerhalb einer Femtosekunde lediglich eine Strecke von 0,3 µm zurück, diese Strecke entspricht etwa einem Hundertstel des Durchmessers eines menschlichen Haares.
